linux-kernel - Re: [PATCH v2] mfd: intel-lpss: Set the device in reset state when init

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Message-ID: <20190508082326.GD3995@dell>
Date:   Wed, 8 May 2019 09:23:26 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Binbin Wu <binbin.wu@...el.com>
Cc:     rjw@...ysocki.net, linux-pm@...r.kernel.org,
        gregkh@...uxfoundation.org, mika.westerberg@...ux.intel.com,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        andriy.shevchenko@...ux.intel.com
Subject: Re: [PATCH v2] mfd: intel-lpss: Set the device in reset state when
 init

On Mon, 08 Apr 2019, Binbin Wu wrote:

> In virtualized setup, when system reboots due to warm
> reset interrupt storm is seen.
> 
> Call Trace:
> <IRQ>
> dump_stack+0x70/0xa5
> __report_bad_irq+0x2e/0xc0
> note_interrupt+0x248/0x290
> ? add_interrupt_randomness+0x30/0x220
> handle_irq_event_percpu+0x54/0x80
> handle_irq_event+0x39/0x60
> handle_fasteoi_irq+0x91/0x150
> handle_irq+0x108/0x180
> do_IRQ+0x52/0xf0
> common_interrupt+0xf/0xf
> </IRQ>
> RIP: 0033:0x76fc2cfabc1d
> Code: 24 28 bf 03 00 00 00 31 c0 48 8d 35 63 77 0e 00 48 8d 15 2e
> 94 0e 00 4c 89 f9 49 89 d9 4c 89 d3 e8 b8 e2 01 00 48 8b 54 24 18
> <48> 89 ef 48 89 de 4c 89 e1 e8 d5 97 01 00 84 c0 74 2d 48 8b 04
> 24
> RSP: 002b:00007ffd247c1fc0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffffda
> RAX: 0000000000000000 RBX: 00007ffd247c1ff0 RCX: 000000000003d3ce
> RDX: 0000000000000000 RSI: 00007ffd247c1ff0 RDI: 000076fc2cbb6010
> RBP: 000076fc2cded010 R08: 00007ffd247c2210 R09: 00007ffd247c22a0
> R10: 000076fc29465470 R11: 0000000000000000 R12: 00007ffd247c1fc0
> R13: 000076fc2ce8e470 R14: 000076fc27ec9960 R15: 0000000000000414
> handlers:
> [<000000000d3fa913>] idma64_irq
> Disabling IRQ #27
> 
> To avoid interrupt storm, set the device in reset state
> before bringing out the device from reset state.
> 
> Changelog v2:
> - correct the subject line by adding "mfd: "
> 
> Signed-off-by: Binbin Wu <binbin.wu@...el.com>
> Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> ---
>  drivers/mfd/intel-lpss.c | 3 +++
>  1 file changed, 3 insertions(+)

Applied, thanks.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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